AuthSession is an add-on interface for Session. It provides support for the AUTH extension.

A SMTP server backend.

The Backend implements SMTP server methods.

BackendFunc is an adapter to allow the use of an ordinary function as a Backend.

A Client represents a client connection to an SMTP server.

DataCommand is a pending DATA command. DataCommand is an io.WriteCloser. See Client.Data.

DataResponse is the response returned by a DATA command. See DataCommand.CloseWithResponse.

LMTPDataError is a collection of errors returned by an LMTP server for a DATA command. It holds per-recipient errors.

LMTPSession is an add-on interface for Session. It can be implemented by LMTP servers to provide extra functionality.

Logger interface is used by Server to report unexpected internal errors.

MailOptions contains parameters for the MAIL command.

RcptOptions contains parameters for the RCPT command.

SMTPError specifies the error code, enhanced error code (if any) and message returned by the server.

A SMTP server.

Session is used by servers to respond to an SMTP client. The methods are called when the remote client issues the matching command.

A Session is returned after successful login.

StatusCollector allows a backend to provide per-recipient status information.

lineLimitReader reads from the underlying Reader but restricts line length of lines in input stream to a certain length. If line length exceeds the l

parser parses command arguments defined in RFC 5321 section 4.1.2.

toServerNoRespAuth is an implementation of Auth that only implements the Start method, and returns "FOOAUTH", nil, nil. Notably, it returns nil for "t